Core for use in the construction of hollow concrete walls.



.l. BLOMBERG. CORE FOR USE IN THE CONSTRUCTION OF HOLLOW CONCRETE WALLS.

APPLICATION FILED OCT. 1912.

Patented July 25, 1916.

-$HEET' l 2 SHEETS J. BLOMBERG. CORE FOR USE IN THE CONSTRUCTION OF HOLLOW CONCRETE WALLS.

APPLICATION FILED OCT. 7. 1912.

2 SHEETS-SHEET 2.

lilliiiiiil'i Wig MT ,F (5. five/afar run s'rn rns PATENT OFFICE.

JOHANNES BLOMBERG, OF TABY, SWEDEN.

GORE FOR USE IN THE CONSTRUCTION OF HOLLOW CONCRETE WALLS.

Specification of Letters Patent.

Patented July 25, 1916.

Application filedOctober 7, 1912. Serial No. 724,441.

dent of Taby, Sweden, have invented cer-.

tain new and useful Improvements in Cores for Use in the Construction of Hollow Goncrete Walls, of which the following is a specification.

It has heretofore been proposed to construct molding apparatus for hollow concrete walls by using cores, the walls of which were connected at several places by linked elements in order to collapse the core before removing the same from the finished wall. However the removal of these cores required the employment of special tools. In order to avoid this applicant constructed his core in such a manner that it can be removed by a single operation and without the employment of certain tools. With this end in view the core is so constructed that its walls are coupled in such a manner to a common central member that a simple pull at the end of said member will be sufiicient to remove the core from the finished wall. In operation first one pair of the walls forming the core will be removed from the finished wall and then the other, after which the entire core may easily be removed without the necessity of using special tools.

Another object of the invention is to provide a core for the construction of hollow concrete walls by which one pair of the core walls is adapted to lock the other pair in its adjusted working position.

A still further object of the invention is the construction of the core in which the central members of several of the cores are coupled by means of chains which construction allows the successive removal of all cores from the finished walls.

In the accompanying drawings: Figure 1 represents the horizontal section of a wall core or mold with lateral walls as well as the devices for collapsing said core, the core As shown in Figs. 1 to 4; the core consists of wooden side walls 10 and end walls 21 which in the working position of the core or mold defined in cross section lies within the circumference of the wall to be constructed. Within the space formed by these walls a common centralsupporting member 12 is ar ranged which is connected with the end walls 21 in the well known manner by means of links 28, which are connected as shown at 27 to the end walls 21 and at 26 to the central member 12. This central member is guided through an angle iron or bracket 29 secured to one of the walls 10. The member 12 is furthermore connected to the side walls 10 through links 13 which are secured to the latter by means of a bolt 24c guided within a slot 23 of the member 12. Laterally disposed strengthening borders 22 secured to the side walls 10 form also part of the end .walls 21.

.23. Simultaneously the links 28 are moved toward the outside and enter the space between the borders 22 so thatin the alined position of the links 13 the side walls 10 are locked or held in their working position. If the central member 12 is raised after the wall has been constructed, theend walls 21 are returned into their former position by means of the links 28 because the bolt 24 can freely work within the slot 23. As soon as the lower edge of the slot engages the bolt 24 also the side walls 10 are withdrawn from their spread position and the core can now be removed from the finished wall structure by exerting a pull on the end of the central member 12.

As shown in the modification illustrated in Figs. 5 to 7 which in general is identical with that form of the invention illustrated in Figs. 1 to 4, the end walls 21 are con siderably longer thus giving the core a considerably greater width.

I claim:

1. In a core for use in the construction of hollow concrete walls, a mechanism for collapsing one set of the core walls first and then the other, comprising in combination, side and end walls, a common central supporting member for both the side and the end walls, means connecting the central member With the end Walls of the core adapted to collapse said end Walls upon the raising of said central member, and means connecting said side Walls with said central member for collapsing the same after the collapse of said end Walls substantially as described.

2. In a core for use in the construction of hollow concrete Walls, a mechanism for collapsing one set of the core Walls first and then the other, comprising in combination, side and end Walls, a slotted common central supporting member for both the side and the end Walls, links connecting the central member With the end Walls of the core adapted to collapse said end Walls upon the raising of said central member, a guiding bracket secured to one of the side Walls for guiding the slotted central member, links connecting the central member With said side wallsya bolt guided Within the slots of said central member for effecting said connection and allowing the collapse of the side Walls after the collapse of the end Walls upon the engagement of the lower edge of said slot by said bolt, substantially as described.

In testimony whereof I afiix my signature in presence of two Witnesses.

J OHANN ES BLOMBERG. Witnesses:

ERNEST VAN LUNDT, IRMA LINDEBERG.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

